982 Appendix F. is also used on bar work generally. Its description will be under- stood by reference to Plate XIX. and to Fig. 908. It may be traversed in any of three ways: (i) by hand, (2) by self-acting shaft, (3) by leading screw. The hand traverse is obtained by handwheel i, wheels 2 and 3, and rack pinion 4. The self-act is taken from shaft h through pinions 9 and TO, worm and wheel 5 and 6, and wheels 7, 3, and 4. The worm wheel is carried in a cradle 12, hinged round the shaft //, and held in position by a stop or trigger 13. Whenever the hand traverse or cross feed are to be used, the traverse worm 5 is released by dropping the cradle by handle 8, after releasing catch 13. The clamp n fixes the saddle for heavy tooling. Hexagon LaJLtte. Se&Lion JVLidL FAQ. 90S. As there are four tools to this head, so also are there four release stops to the traverse motion, each of which may be turned into position by hand. The stops ar$ seen in Figs. 905-6, Plate XIX., being carried on a block projecting from the leflf end of saddle. They may be adjusted longitudinally, so as to strike the rod 15 at any given position of the saddle, the latter being also adjustable for the same purpose. The strike causes 16 to move a spindle to the right, and operate trigger 13, releasing the worm cradle and stopping the saddle. A second worm 17 (Plate XIX.) drives a wheel 18, and thus the cross feed is obtained through wheels 19, 20, 21, and screw 22 ; or hand feed may be given by wheel 24, if trigger 23 be moved rightwards by hand to drop the cross-feed worm cradle. A bar 25 carries four stops 26, set in convenient positions, and each.